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Novel solutions to low-frequency problems with geometrically designed beam-waveguide systems

Author
Imbriale, W. A.
Published
Aug 15, 1995.
Physical Description
1 electronic document
Additional Creators
Manshadi, F. and Esquivel, M. S.
Online Version

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Restrictions on Access
Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
The poor low-frequency performance of geometrically designed beam-waveguide (BWG) antennas is shown to be caused by the diffraction phase centers being far from the geometrical optics mirror focus, resulting in substantial spillover and defocusing loss. Two novel solutions are proposed: (1) reposition the mirrors to focus low frequencies and redesign the high frequencies to utilize the new mirror positions, and (2) redesign the input feed system to provide an optimum solution for the low frequency. A novel use of the conjugate phase-matching technique is utilized to design the optimum low-frequency feed system, and the new feed system has been implemented in the JPL research and development BWG as part of a dual S-/X-band (2.3 GHz/8.45 GHz) feed system. The new S-band feed system is shown to perform significantly better than the original geometrically designed system.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19960009482.
Accession ID: 96N16648.
The Telecommunications and Data Acquisition Report; p 138-150.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15651731